The soil horizon which includes incompletely weathered bedrock shards and perhaps the weathered upper surface of the bedrock is called the ______ horizon
a) A
b) B
c) C
d) E
e) O
Ans: c) C
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The energy that allows tectonic plates to interact on the earth's surface is supplied by:
A. the sun. B. the molten interior. C. greenhouse gases. D. ocean currents.
The big bang, in which the universe as we know it originated, occurred about: a. 10,000 years ago
b. 25 billion years ago. c. 13.7 billion years ago. d. 13.7 million years ago.
How does the location of the ITCZ appear to be related to Earth’s seasons? What will be an ideal response?
The United Nations' best estimate is that the global population will ________
A) level off at approximately 10 billion in the year 2100 B) begin to decline by the middle of the 21st century as humans deplete Earth's resources C) reach 13 billion by the year 2080 D) continue to increase indefinitely